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F'INAL REPORT PEAK F'LO\ry.CULVERT DESIGN STUDY: PET{TICTOD{ FOREST DISTRICT Prepøredfor: Prepared by: Weyerhaeuser Company Limited Summit Environmental Consultants Ltd. B.C. Timberlands 174 - 100 Kalamalka Lake Road 668 St. Anne Road Vemon, B.C. VlT 7M3 Armstrong, B.C. VOE 1BO Project 042-13.00 October 2000 gl4 October 18,2000 Reference: 042-13.00 Mr. Nick Kleyn, R.P.F. Weyerhaeuser Company Limited. - B.C. Timberlands 668 St. Anne Road Armshong, B.C. VOE 1BO Dear Mr. Kleyn: Re: Peak Flow - Culvert Design Study for Penticton Forest District Summit Environmental Consultants Ltd. is pleased to provide you with two copies of the Final Report on the above-noted study. The report presents our peak flow regionalisation for the Penticton Forest District, and discusses the features, assumptions and limitations of the computer program CULVERT (Ver. 6.1) that uses the results of this regionalisation for estimating required culvert sizes. We have enjoyed working on this project, and would be pleased to provide any additional assistance you may require. Please call me at 545-3672 if you have any questions or wish to discuss any aspect ofthe report. Yours truly, Summit Environmental Consultants Ltd. Brian T. Guy, Ph.D., P.Geo., P.H. President Senior Geoscientist Enclosures: 2 copies of Final Report TABLE OF CONTENTS LETTER OF TRANSMITTAL.... .................. i TABLE OF CONTENTS.............. ................ ii LIST OF TABLES ....................iii LrsT oF FTGURES.. ................. iii LrsT oF ATTACHMENTS ............. ........... iii 1.0 rNTRODUCTrON......... ........................1 2.0 DESTGN PEAK FLOW r{YDROLOGY............ ........................3 2.1 Background ....................3 2.2 Index Flood Method...... ....................4 2.3 Rational Formula Method...... ...........7 2.4 Recommended Design Peak Flow Curves ...........7 2.5 Guidance for Selection of Peak Flow Zone .........8 2.6 Guidance for Model Use in Areas Affected by Hydrologic Storage. .........9 3.0 CULVERT HYDRAULTC ANALYSTS ............ .......................19 3.1 Overview... ...................19 3.2 Circular CMP and Pipe Arch Culverts..... ..........19 3.3 Rectangular Structures and Bridges Over Trapezoidal Channels ............22 4,0 CULVERT COMPUTER PROGRAM .......,..,,,......24 5.0 LTMITATIONS OF PEAK FLOW MODEL AND CULVERT (VER. 6.1) COMPUTER PROGRAM ............26 6.0 REFERENCES ............. ......................28 Appendix A Design Peak Flow Analysis: Penticton Forest District. Appendix B Culvert Sizing Checklist. Summit Environmental Consultants Ltd. FINAL REPORT Project#042-13.00 ii l8-October-2000 LIST OF TABLES Table2.l. Relationship between design culvert size and watershed area for 400 mm and 2000 mm CMPs. .........................8 Table2.2. Ratio of actual to predicted 100-year design flows for streams affected by natural lakes. ............10 Table 3.1. Standard pipe arch si2es........... ...................2I LIST OF FIGTIRES Figure 1.1. PentictonForestDishict. ...........2 Figure 2.1. Recommended design curves for the 50-year return period annual maximum instantaneous discharge - Zone 1: Southem Okanagan Basin.......... ....................11 Figure 2.2. Recommended design curves for the 5O-year retum period annual maximum instantaneous discharge - Zone 2: Northern Okanagan 8asin.......... ....................I2 Figure 2.3. Recommended design curves for the 50-year return period annual maximum instantaneous discharge-Zone 3: Eastern Okanagan Highland and Okanagan Range. .........13 Figure 2.4. Recommended design curves for the 5O-year return period annual maximum instantaneous discharge - Zone 4: Upper Kettle River.......... ............14 Figure 2.5. Recommended design curves for the 100-year return period annual maximum instantaneous discharge-Zone 1: Southern Okanagan 8asin.......... ....................15 Figure 2.6. Recommended design curves for the 100-year return period annual maximum instantaneous discharge - Zone 2: Northern Okanagan Basin......... .....................16 Figure 2.7. Recommended design curves for the 100-year return period annual maximum instantaneous discharge-Zone 3: Eastern Okanagan Highland and Okanagan Range. .........17 Figure 2.8. Recommended design curves for the 100-year retum period annual maximum instantaneous discharge -Zone 4: Upper Kettle River.......... ............18 Figure 3.1. Schematic diagram of rectangular and trapezoidal structures... ........24 LIST OF ATTACHMENTS Map l: Peakflow zoîemap forPentictonForestDistrict...... .Pocket 1 Installation CD-ROM for CULVERZVersion 6.1............. ......Pocket 2 Summit Environmental Consultants Ltd. FINAL REPORT Proiect #042-13.00 lll l8-October-2000 1.0 INTRODUCTION The Forest Practices Code of British Columbia Act (the Code) and Regulations provide design criteria for bridges and culverts. Culvert and bridge sizing is based on calculating the minimum opening required to pass the 100-year retum periodl peak flow for all stream culverts and permanent and semi-permanent bridges, and the 5O-year return period peak flow for temporary bridges and all other culverts. The Forest Road Engineering Guidebook (MoFil\4ELP, 1995) provides a simple default method of estimating the diameters of circular comrgated metal pipes (CMPs) needed to safely pass 100-year design flows. However, experience in some parts of British Columbia has suggested that the simple guidebook method tends to overestimate the required pipe sizes. In addition, there is little guidance for estimating 5O-year design flows, or for sizing structures other than circular CMPs. The Community Watershed Guidebook (MoF/\4ELP, 1996) presents a method for estimating 100-year design flows which is based on an earlier hydrologic study of the entire province. However, this method does not reflect local or regional variations in peak flows, nor does it provide any information on the uncertainty of the design flow estimate. The objectives of the present project are to develop a reliable method for estimating 5O-year and 100-year design peak flows within the Penticton Forest District (Figure 1.1), based on local information and accepted techniques, and for sizing the structures necessary to safely pass these design flows. ' Return period is a way of expressing the exceedance probability. The probability ofthe 100-year peak flow being equalled or exceeded in any given year is l/100 or 0.01. In other words, in any year the odds that this flow will be equalled or exceeded are 1 in 100. Summit Environmental Consultants Ltd. FINAL REPORT Proiect#042-13.00 I l8-October-2000 Figure 1.1. Penticton Forest District. =tl ld$t' qtl¡ FrnliËttrr! HlFlst Summit Environmental Consultants Ltd. F'INAL REPORT Proiect #042-13.00 2 l8-October-2000 The study involved two components: 1. a peak flow hydrology study, and 2. development of Version 6.1 of computer program CULVERT, in which the design flow hydrology for the Penticton Forest Dishict (PFD) and an analysis of culvert hydraulics are combined to simpli$r the process of estimating design peak flows and culvert sizes. This report provides a summary of the hydrology study, reviews the culvert hydraulic analysis, and introduces the computer program (CULVERT, Ver. 6.1). The hydrologic methodology is described in more detail in Appendix A, and a Users Manual for program CULVERT (Ver. 6.1) is provided in a separate report (Summit, 2000). The hydrologic analysis and the CULVERZ (Ver. 6.1) program reported herein have been developed specihcally for use within the boundaries of the Penticton Forest District. CULVERT (Ver. 6.1) is protected by copyright and its use is governed by a licence agreement. The program cannot be used by any party not holding a valid licence agreement, and cannot be used for any purpose other than the estimation of design flows and culvert sizes for locations within the boundaries of the Penticton Forest District. DESIGN PEAK F'LOW HYDROLOGY 2.1 BacrcnouNo This section presents a summary of the design peak flow study. A detailed presentation is included in Appendix A. The peak flow hydrology study included two components: l. review of existing dat4 information, reports, and analyses relevant to the hydrology of the Penticton Forest District, and 2. development of an appropriate methodology for estimating the required design flows, which comprises both the Index Flood Method and the Rational Formula Method. Summit Environmental Consultants Ltd. FINAL REPORT Project #042-13.00 3 l8-October-2000 2.2 Inonx Fr,oon METHoD The Index Flood method has been used to estimate design discharges for ungauged watersheds larger than 10 km2 in area within the Penticton Forest District (the study area). This method is consistent with the methodology presented in the Communþ Watershed Guidebook (MoF/I\4ELP, 1996). All of the streamflow gauging stations2 in the southern interior of British Columbia (and several in Washington State) that were operational during the past century were examined for relevance to the project and the study area. Streamflow data from 62 of these stations was used for the analysis. These 62 stations were selected because they are not regulated and their watersheds contain no major lakes or wetlands that could significantly moderate the annual flood hydrograph. The locations of the relevant stations within and adjacent to the Penticton Forest District are indicated on Map 1, attached. The data for each station was used to calculate the mean annual peak daily discharge for the period of record. The estimate was then adjusted to a long term mean based
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